Grinding machine



GrRINDINGr MACHINE Flled Jan 4, 1923 E. B. GARDNER ET AL March 6, 1928.

` f A' l Patented Mar. 6, 1928.

UNIT-ED` STATES PATENT oFElfcE.

EDWARD D. GARDNER,l RALPH D. GARDNER, AND'aoHN NIEDSEN, on BELorr,

WISCONSIN.

GRINDING MACHINE.

Application ined :axillary-1, 1923. semaine. 610,548..

This' invention relates in'general to grinding. machines and aims to provide ay machine of large capacity, which will be automatic in its operation, and capable Vof turning out large quantities of work.

With these ends in View our invention contemplates the provision of a machine having a plurality ofgrinding wheels, and also the,

tioned on onetable, it will be automatically subjected" tov the grinding operation while the operator is free to remove and replace the work at the other wheel.

of` being* attended by one operator, who removes a finished piece-of work from one table and replaces it by apiece to be finished, while another piece is being operated upon at the-other station. By dividing his time alternately between the two stations, the op erator isA enabled to .secure continuous operation of the machine without loss of'time, so that largeproduction of the machine results.

Another purpose ofl the invention is to providea dresser for each grinding wheel, whichdressersare so mounted that they may be moved into operative position to dress the face 'of the wheel without interfering with the grinding operation of the wheel, which may be simultaneously performed.

Another' object isto provide suitable adjustments whereby the dressers may be accuratelyL positioned with respect to Vtheir grinding: wheels, and whereby the length of the stroke of the work tables may be regu lated in accordance with the dimensions Vof thefwork to be ground; and also adjustments for 'accuratelyL positioning the tables relatively to theirrespective grinding wheels.

Other objects and advantages of this invention shouldv` be readily `appreciated as the same becomes better understood byrefer ence to the following description, when considered inv connection with the accompanyindrawings:

eferring tol the drawings: j Fig." 1f is a sideelevation of a grinding machine'embodyingour invention; I j Fig. 2" is 'anendf elevation thereof, looking toward? the left at Fig; l;

Fig, 3l isa fragmentary plan viewl of'one a Y facelofthe gridingwheel, andthe eXten't'of' of* the wheel dresser mountings; and

' power.

are fixedly mounted the grinding wheel The machine is therefore a two station machine, capabley Figji is an elevationk ofthe structure l shown in Fig. 3.

By reference` tol the drawingsit will be observed that the machine comprises a suitable base 3 uponl which the Various operating mechanisms are mounted. The frame of the machine carried by the base includes a standard 4, the upper portion of which is provided with a pair of aligned bearings. 5 in which the grinding wheel 'shaft is journaled, this shaft being adaptedy toA be-driven througha pulley 7 fixed thereon from a belt 8 connected with any `suitable source of* Upon the ends ofthis shaft there f chucks 9 and 11, equipped respectively with the abrasive disks or Wheels 12 and 13.

These wheels being faced in opposite direc-l tions, and continuously rotated; it will be manifest that two grinding stations are provided by the machine; Since the work supports, the mechanismfor operating the same, and the wheel ldressers are substantiallyV identical in structure and operation at each' station, the detaileddescript-ionand the reference characters employed to designate the parts should lie-understoody as referring to both stations or the machine.

Upon a. linee 14 at the end of the base 3l there is adjustably mounted a standard 15,` equipped with bearings 16 in which is journaleda rock shaft 17. An upstanding guide.y 18 'xedfon this shaft carries an adjustable post 19,on the upper end 'off which i's` adjustably vmounted the work table 21. This tablecomprises the stationary portion 22and the slidable top 23 upon which the work to beoperatedupon is secured'by suitable holders (not shown). fr coil spring E24, connected at one end to; a` stud Q5 projecting laterally from the stationary portion Vof the table, is connecte-dat its other endwith a threaded rodwhich projects through anv eyeformed in a bracket, 27, clamped by means of a set screw 28V to a 'lever 29 by which the table top is moveditowardand froml the grind-ing wheel. Then connection between this lever and the table top by which movements of. the lever'A may betransmitted' to the top, maybe of anyfpreferred `'coni struction, one form being disclosed-in PatentlThe actionofthe-vsprng 24, up'onthe lever yieldingly urgesf the table topftoward4 the movement ot the top toward the wheel is regulated by a micrometer adjustable abutment 3l. The tension upon the spring Q4; may be regulated by an adjustable nut 32. The table is counter-balanced so as to normally be sustained in substantially upright position by a countt-a'weight l2-l tixed to the outer end ot the shatt lt".

Swinging movements ol the table about the rock sha it li' as a center tor the purpose ol movingl theI work across the l'ace ol the wheel, are automatically imparted to the table by mechanism which will now be described. At its inner side the table supporting guide lo' is provided with an arm l-l, the upper end ot which is eipiipilied with a T slot` 3() in which is adjustably mounted a laterally project-ing stud 35. A link 3U provided with an open sided slot 37 adapted to receives-aid stud, whereby the link is connected to the table. The opposite end ot the link 3G is connected to a rotatable wheel or crank disc 3S by means ot ay wrist pin $539, adjustably mounted in a diametral undercut groove Lll, 'formed in the tace ot the dise 25S. lt will be obvious that rotation of the disc 38 will, through the link 30, impart an oscillatory movement to the work table, the length of the stroke of which may be regulated by adjusting the position ot the wrist pin 39 in the groove Lt1 so as to vary it.; radial distance from the center ol rotation of thel disk, and the position olf the work table may be adjusted without varying the stroke by adjusting the position ot' the stud 35 in the slot 3 The disk 3S is driven through a gear box containing suitable rcducing gears from a pulley 4Q driven :trom the source ot power by means of a belt all.

For the purpose of dressing the faces ot the wheels, wo mount at the rear of the machine a pair of wheel dressers. Each dresser comprises a tool 4:4, mounted upon a spindle. 45, which is slidably and rotatably supported in an elongated bearing 46. The dresser at the lett-hand side of the machine, viewing Fig. l, is shown in Figs. Il and l. The base of this bearing is grooved as indicated at :t7 to slidingly engage a supporting guide A t8 adjustably carried by a bracket t9, which in turn is bolted to the casing 5l ot' the gear box. A screw threadingly engages with an eye depending from the base of the bearing 46, whereby this bearing may be adjusted, upon manipulation ot' the screw, longitudinally of the guide -lS to adjust the dressing tool toward and from the plane of the tace of the grinding wheel. The spindle 45 is provided at the top Vwith a longitudinally extending groove 523, adapted to receive a. locking pin 5l. by which the spindle is held against rotation.

In order that the dressers may be adjusted angularly with respect to the axis otl the wheels, thereby rendering it possible to dress the wheel faces straight', convex, or concave as as may be desired, we have provided an adjustment for each dresser, the lett-hand one ot which is best shown in Figs. tl and -l-. 'l'he bracket 49 is provided, as shown, with an npstanding pivot pin about which thc guide 48 is rotatably adjustable. A plurality ot' slots 56 Yformed in thc guide concentrically with the pivot pin are adapted to receive fastening bolts 5T threaded into tapped sockets in the brackets, h v which the guide is lol-kcd in adjusted position. Accurate adjustments is atiected by manipulation ot two adjusting screws .38 threaded in opposed relation through spaced ears fifi. projecting upwardly trom the bracket and engagingopposite sides ol' a tail (il projecting from the guide 4S. By loosening the. bolts 57 and manipulating the screws 5%, the dresser may be adjuz-itcd into any desired angular relation with respect to its wheel.

In the operation oic a machine embodying our invention. and assuming that a piece ot work has been completed, the operator li its the Al'ree end oi the link lt out ot engagement with the stud 35, thereby disconnecting the table trom its driving mechanism. lle then presses downwardly upon the lever 2t) and swings the table away from the wheel, whereupon the finished work is removed and is replaced by a piece to be operated upon. The table is then swung toward thc wheel, and connection is rcestablishcd between the stud 35 and the link Bti, `whereupon rotation oli the disk 'lb will oscillate the table back and torth across the tace of the wheel. 'the work during this oscillation otl the tablev is urged toward and into engagement with the tace oit the wheel by the spring 2l, the extent oi" this` movement toward the wheel bcing limited by the adjustable abutment, ill. lVhile this piece ol`; work is being ground, the operator removes a tinished piecey on the table at the other station oil the machine and replaces it by a piece to be operated upon. 3y performing these operations alternately at the two stations, one piece of work is being continuously operated upon while another is being changed, with the result that the machine is operated continuously, and one operator is enabled to attend two wheels instead of being obliged to wait when a piece is being ground.

As these grinding Wheels require frequent dressing, particularly when used upon eertain kinds of work, these dressing operations may be performed whenever necessary without interfering with the grinding operation ot the wheels. The operator simply steps around to the rear of the machine. slides the dresser bar 45 longitudinally in its bearing to dispose the dresser tool 42 in operative relation to the wheel, whereupon.

-if necessary, the dresser may be adjusted toward the wheel by manipulation of the llt) Ilo

adjusting screw 52, and angled if necessary by means of the screws 58. Movement of the dresser toward and from the center' of the Wheel by sliding the dresser bar back and forth in its bearing will enable the ent-ire grinding surface of the revolving Wheel to be properly dressed.

The construction, operation, and many of the advantages of our invention should be understood from the foregoing Without further description, and While We have shown and described a preferred embodiment, obviously the structural details of the machine may be varied Within Wide limits Without exceeding the scope of the inven-A tion, as set forth in the following claims.

We claim:

1. In a grinding machine the combination of a pair of grinding Wheels, a Work table for each Wheel, means for yieldably urging said tables toward their respective Wheels,

adjustable means for limiting the extent ofV vsuch movement, and counter-balanced means for automatically moving said tables parallel with the grinding faces of saidvvheels.

2. In a grinding machine the combination of a pair of grinding Wheels, an oscillatory Work table for each wheel, andV means for automatically oscillating said tables relatively to their respective Wheels, said means tion ofa pair of grinding Wheels, an oscillatory and counter-balanced table for each Y wheel, means for adjusting eachk table ver- Y tically, and a link for detachably connecting said crank `v`with its respective table, the i throw of said crank being adjustable to vary the stroke of said table.

5. In a grinding machine the combination of a base providedvvith a knee, a: rock shaft mounted on each knee, a Work table carried by each shaft, a counterweight suspended from each shaft to counter-balance its table,

a pair of 'grinding Wheels mounted in proxunity to said Work tables, and means for automatically oscillating each Work table` upon its 'respective rock shaft as an axis and across the face of its respective grinding Wheel. .t y

6. In a grinding machine the combination of a pair of grinding Wheels, an oscillatory table for each wheel, means detach--` ably connected' with said tables for auto- `matically oscillating the same, means Whereby the length of the oscillatory stroke of each table may"be`regulated, and means Wherebytheposition of thepath vof vnaovey ment of'each table relatively to its Wheel may be changed withoutlaifecting .the length of the stroke thereof.

7. In a grinding machine the combination of a grinding WheeLxa table mounted to travel adjacent to theV face ofsaid Wheel, and meansdetachably connectedv with the table for oscillating the same, said means including provision for varying the length of thetable stroke and for vvarying the position of said stroke Witlrrespect to said Wheel.

EDWARD B. GARDNER. .Y

. JOHN NIELSEN. iRALPH D. GARDNER. 

